llama.cpp has a Heap Buffer Overflow via Integer Overflow in GGUF Tensor Parsing

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Summary

CVECVE-2026-33298
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-24 01:17:01 UTC
Updated2026-04-30 17:01:02 UTC
Descriptionllama.cpp is an inference of several LLM models in C/C++. Prior to b7824, an integer overflow vulnerability in the `ggml_nbytes` function allows an attacker to bypass memory validation by crafting a GGUF file with specific tensor dimensions. This causes `ggml_nbytes` to return a significantly smaller size than required (e.g., 4MB instead of Exabytes), leading to a heap-based buffer overflow when the application subsequently processes the tensor. This vulnerability allows potential Remote Code Execution (RCE) via memory corruption. b7824 contains a fix.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000170000 probability, percentile 0.042940000 (date 2026-05-05)

Problem Types: CWE-122 | CWE-190 | CWE-122 CWE-122: Heap-based Buffer Overflow | CWE-190 CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Ggml Llama.cpp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ggml-org Llama.cpp affected < b7824 Not specified

References

ReferenceSourceLinkTags
github.com/ggml-org/llama.cpp/security/advisories/GHSA-96jg-mvhq-q7q7 [email protected] github.com Exploit, Vendor Advisory
github.com/ggml-org/llama.cpp/releases/tag/b7824 [email protected] github.com Release Notes
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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